Pfft. Amateurs
The performance of the organ version at St. Burchardi church in Halberstadt, Germany began in 2001 and is scheduled to have a duration of 639 years, ending in 2640.
Also:
The Longplayer is a 1,000-year-long composition by Jem Finer and is played out by computer at several public listening posts around the world.
It began playing on 31 December 1999 and will continue - without repetition - until the last moment of 2999.
